From the home screen, tap and then tap the app’s icon

Create a shortcut to the app in the home screen (see Adding app shortcuts or widgets to the home screen for v4.2 / Adding app shortcuts to the home screen for v5.1)

Use the [UserButtonManager] app to assign the app to one of the unit’s buttons (see Changing the functions assigned to the buttons for v4.2 / Changing the functions assigned to the buttons for v5.1)

Add the app to the [Dashboard] app (see Customizing [Dashboard] for v4.2 / Adding and deleting tiles for v5.1)